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Sneezing when we come into home, stops when go out. Looking for dust? sensor project Answered

Little under two years ago my we moved into a house that had alot of remodel going on prior to us aquiring ownership. I know and have cleaned behind air registers,ugh. I wonder if dust particles are still floating around? I do change furnace filter every 60-90 days. Need to know if have to get more agressive. I am looking for a interior dust detector and not sure which one to try here on Instructables, any sugestions ?

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laetitia2211
laetitia2211

11 months ago

Je suis d'accord avec les messages postés précédemment. La poussière est malheureusement partout !
J'éternue moi même très souvent mais en cette période je pense je sais que cela est dû à mes allergies au pollen. Vous devriez essayer comme le conseil elivide de prendre rdv avec un allergologue pour trouver l'origine de ces éternuements.

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elivide
elivide

1 year ago

You might also want to consider consulting an allergist to identify your exact allergens.

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Downunder35m
Downunder35m

1 year ago

The question would rather be: What exactly makes you sneeze?
Can be an allergic reaction, can be chemical residue, can be mould or spores.
"Dust" is everywhere, to know what is in the dust that causes your reaction is key here.

Open all windows and doors, let the breeze go through the entire house to air it out.
Then go room by room, close doors and windows and wait if you need to sneeze.
If not move to the next room until you find the one(s) that cause you problems.
At least this way you can eliminate some causes.
If you struggle in al rooms the same I suspect the carpet or things inside your walls.

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Jack A Lopez
Jack A Lopez

1 year ago

Does your filter actually have dust in it when you change it?

And if the answer to that question is, "yes," do you think there is enough dust there to measure?

I mean, does the dust have mass and weight? Enough weight to put it on a scale and weight it?

Or maybe, if the dust is light and fluffy, it would be easier to measure its volume, either as a thickness multiplied by an area, or... I do not know if you have enough to shake it into a graduated cylinder and measure its volume that way?

Anyway, that is one kind of dust detector: the integrating kind. I mean it is a contrivance that collects dust. Then you measure the dust. Then you divide by the quantity of air that moved through the filter, and the quotient is an average value, over the period during which the filter was collecting dust.

Another kind of dust measurement is the instantaneous kind, and that kind is mostly what I find when I ask the Instructables Let's Make search to show me: "dust detector"

https://www.instructables.com/howto/dust+detector/

Moreover these 'ibles seem to me to be based on, what I will call, "black box modules."

I mean, in principle I can imagine how these work, and read the documentation which explains how they work; e.g. via photometric methods, shining a light through a tiny box, and measuring how much light is transmitted, or scattered back, or whatever.

But in practice, making this kind of module work seems to be a matter of hooking it up to a micro-controller, and reading numbers out.

For some people that is good enough: Trust what the box says. Call it good.

But I dunno. I always have these nagging doubts about whether the sensor is actually sensing what I think it is, especially for a sensor I am unfamiliar with.

And that necessitates building some kind of experimental setup, for to calibrate the sensor, and figuring out how to do that.

Also ask yourself, do you know what threshold of measured dust (e.g. in micrograms per liter, or volume fraction, or similar ) is necessary to induce sneezing? Then read the data sheet for the module first, to discover if it can actually measure a quantity of dust that low.

Also some people sneeze in response to unusual, non-dusty, stimuli, like bright sunlight. I had a friend in high school who sneezed as a reaction to sunlight, and the Wiki tells me sunlight sneezing is a real thing. Although I am not sure if have the same response, but I am not sure I should expect to, because the Wiki says this response is genetic, if otherwise not well understood.

https://en.wikipedia.org/wiki/Photic_sneeze_reflex

By the way, if you want a really cheap way to detect dust, but that is not exactly quantitative...

Just point the beam from a laser pointer into a dark room where you expect to find dust, and you will see it, in the form of light scattered back from tiny dust particles in the beam. A more clearly visible beam, means a more dusty room.